(ordered by popularity)
adverse
negative
possible
term
beneficial
toxic
side
positive
significant
direct
ill
similar
harmful
special
potential
serious
deleterious
environmental
physiological
indirect
psychological
biological
immediate
differential
detrimental
undesirable
profound
bad
therapeutic
secondary
sound
systemic
after
evil
cumulative
clinical
acute
inhibitory
cardiovascular
behavioral
disastrous
damaging
severe
dramatic
opposite
fewer
lasting
reaching
destructive
injurious
untoward
visual
powerful
thermal
additive
unwanted
genetic
devastating
random
hemodynamic
anticholinergic
mechanical
protective
dynamic
observed
related
nonlinear
unpleasant
minimal
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